Centigraph Adding Machine Explained

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Centigraph Adding Machine is an adding machine that has been around since 1880. Incredibly, Arthur acquired the patent (no. 453,778) 11 years later of its invention.

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Arthur Ewing Shattuck invented the Centigraph Adding Machine in 1891. Arthur E. Shattuck of San Francisco, California, got four calculating devices patents in the United States and one in Canada.

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Facts about Centigraph Adding Machine

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Centigraph Adding Machine: How It Worked

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Centigraph Adding Machine: Historical Significance

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Centigraph Adding Machine Explained

Everything You Need To Know